Add scan action filter to scanExecutionPolicies graphql query

What does this MR do and why?

Addresses #344687 (closed)

This MR adds action_scan_types filter to scanExecutionPolicies graphql resolver.

Screenshots or screen recordings

Policies containing given scan action

No policies with given scan action

Policies

How to set up and validate locally

1. Go to Security Policy -> Policies, click on New Policy, select Scan Execution as Policy type.

2. Paste policy:

   type: scan_execution_policy
   name: Container Scanning Policy
   description: This policy executes container scanning on the project
   enabled: false
   rules:
   - type: pipeline
     branches:
     - main
   actions:
   - scan: container_scanning

3. Create new MR with updated policy and hit merge.

4. Go to graphql-explorer and run the query:

query {
  project(fullPath:<project_path>) {
    scanExecutionPolicies(actionScanTypes:[CONTAINER_SCANNING]) {
      nodes {
        name
        description
        yaml
      }
    }
  }
} 

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